Pump.



W. H. HEARD.

PUMP.

, APPLICATION FILED PEB.7, 1908. y 948,302. Patented Feb. 1, 1910.

'JF (I /fy l',

A TTOR/v 5 UNITED STATES PATENT oEErcE.

WILLIAM H. HEARD, OF LONDON, ONTARIO, CANADA.

PUMP.

Original application led February 7, 1906, Serial No. 299,943. Divided and this application filed February.

Patented Feb. 1, 1910.

7, 1908. Serial No. 414,833.

To all whom it may concern.'

Be it known that I, WILLIAM I-I. HEARD, of the city of London, in the county of Middlesex and IProvince of Ontario, Canada, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

My object is to devise a simple and effective combined safety valve, by-pass from the pressure to the suction sides of the pump, and a tank iiller, and my invention consists essentially of the constructions hereinafter more specifically described, and then denitely claimed.

Figure l is a vertical section through the valve chest of a spray pump, the by-pass and safety valve. Fi 2 is a vertical section on the line :zz-y in Fig. l. Fig 3 is a vertical section showing the by-pass combined with a filler. Fig. 4 is a sectional plan view of the same.

In the drawings like letters of reference indicate corresponding parts in the diiferent figures.

I show my invention` in connection with the valve chest of a spray pump, but as this forms no part of the present invention it is unnecessary to describe it in detail. Sufiice it to say that D is the suction chamber, F the pressure chamber, H H discharge pipes, a a collar for the connection of an air chamber, and K K the Valve casings, provided with ball valves, as shown, controlling the openings between the suction chamber D and the intermediate chambers E, and between the intermediate chambersand the pressure chamber F. rIhe intermediate chambers E, it will be seen on reference to Fig. 2, communicate withl the plungertubes I. f

In power driven machines there is a special danger of the pressure in the pressure side of the pump becoming too great and it is necessary to provide means for its automatic relief. For this purpose I provide the combined safety valve and by-pass, shown more particularly in Fig. 1. A casing U is secured t-o the valve chest C preferably by being screwed into the collar formed thereon. The position of this casing is such that it communicates with the suction opening b of the valve chest. The casing is also provided with an opening u adapte to register with the opening 'u communicatingl with the pressure chamber F of the valve chest. 0n the casing U is screwed the bonnet V, through which s screwed the valve stem A. On this valve stem is formed or secured a stop disk a. On the end of the stem is slipped a sleeve b carrying the valve disk B. In the side of the sleeve is formed a slotthrough which passes a pin o into the stem A. valve disk is placed a coil spring d tending normally to hold the valve disk B against the opening u. The stop disk a is provided with a seat e against which it may be screwed by revolving the stem A. When the stop disk is in contact with its seat,it will be seen that the pin c is intermediate the ends of the slot in the sleeve b', so that the valve disk B is held against the opening u by the pressure of the spring. Thus, if at any time lthe pressure in the pump becomes excessive, it is relieved, by the lifting of the valve disk B, into the casing, and thence into the suction pipe C connected with the casing.

When starting the pump it is sometimes desired to blow back from the pressure side of the pump through the suction pipe, to clear the strainer, or for other purposes, and this may be done at any time by turning the stem and withdrawing the stop disk a and the valve disk B from their seats. Owing to the Slot and pin connection between the valve disk and the stem, the stop disk comes away iirst from its seat, and subsequently the valve disk, the reverse being the case when the stem is screwed in. The stop disk contacting with its nseat effectually prevents the coil spring D being compressed to give too great a tension on the valve disk.

It will be noted that owing to the slot and pin connection the valve disk rotates with the valve stem. This enables it to grind any small particles off its seat, which might otherwise prevent its fitting tightly.

I prefer to employ with the by-pass and safety valve an arrangement whereby the pump may be caused, when desired, to refill the tank' with which it is employed. I show the arrangement for this purpose in Figs. 3 and 4f.v The by-pass and safety valve remain as before, but in addition to the suction pipe C I provide a second Suction pipe D', and provide a suitable hand valve operated through the side of the casing and adapted to close the second suction pipe, as shown in Fig. 4. Between the suction pipe C and the suction opening f I form an opening g', adapted to be closed by the valve Between the stop disk and the' E. Thus by operating the valve E either the suction pipe C or the suction pipe D may be placed in communication with the opening f', and thus with the suction side of the pump. "When the valve E is in the position shown in Fig. 4 the suction is through the `pipe C, thence through the opening f into the valve casing. If, however, the valve E be operatedto close the opening g', and by opening the by-pass and safety valve the suct1on is through the pipe D, and through the opening f into the pump, thence from the pressure side of the pump through the openings lv and u into the pipe C. If the plpe D be connected with a source of supply, the tank may be readily lled through the suction pipe C. As soon as the tank is lled the valves are again closed, as shown in Figs. 3 and 4, and the machine is ready for operation in the ordinary manner.

Thus from the construction described it will be seen that I provide a safety valve, by-pass and Eller by means of a simple construction employing only two valves, conveniently arranged, adjacent to one another.

What I claim as my invention is:

l. In a valve chest provided with a pressure side and a suction side and having a valve controlled communication between them, and having also a by-pass communication between the two sides, the combination of a spring actuated safety valve normally closing the by pass communication and means for closing said valve or for positively opening it to permit free communication between the pressure and suction sides of the pump, means for varying the tension of said springy actuated valve, and means for limiting the increase of tension to prevent thev valve being forcibly held closed, substantially as described.

2. A by-pass connection between the pressure and suction sides of a pump, comprising a casing having an opening therein for communication with the pressure side of the pump and an openin for communication with the suction side o the pump; a suction pipe communicatin with the casing; a valve isk adapted to -c ose the first mentioned o ening; a stem on which the said disk is s 'idable; a stop disk on the stem; a seat in the casin for the stop disk; a spring adapted to hold't e valve disk against the aforesaid opening when the sto disk is on its seat; and means for operating the stem to press the stop disk a ainst its seat or to retract both the stop disk and valve disk, substantially as described.

3. A by-pass connection between the pressure and suction sides of a pump, comprlsing a casing having an opening therein for communication with the pressure side ofthe pump, and an openin s for communication with the suction side o the pump; a suction pipe communicating'with the casing; a valve aliases disk adapted to close the first mentioned opening; a stem on which the said disk is slidable; a stop disk on the stem; a seat in the casing for the stop disk; a spring adapted to hold the valve disk against the aforesaid opening when the stop disk is on its seat; means for opera-ting the stem to press the stop disk lagainst its seat or to retract both disk and valve disk, the parts being so proportioned that asfthe disks are forced home the valve disk contacts before the other, substantially as described.

4. A by-pass connection between the pressure and suction sides of a pump, comprising a casing having an opening therein for communication with the pressure side of the pump, rand an opening for communication with the suction side of the pump; a suction pipe communicatin with the casing; a valve disk adapted to c ose the first mentioned opening; a sleeve to which the disk is connected; a valve stem on the end of which the sleeve is slidable; a stop disk on the stem; a seat in the casing for the stop disk; a spring on the stem tending to force forward the valve disk; and means for operating the valve stem, substantially as described.

5. A by-pass connection between the pressure and suction sides of a pump, comprising a casing having an opening therein for communication with .the pressure side of the pump, and an opening for communication with the suction side of the pump; a suction pipe communicatin with the casing; a valve disk adapted to c ose the first mentioned opening; a sleeve to which the disk is connected; a valve stem on the end of which the sleeve is slidable; a stop disk on the stem; a seat in the casing for the stop disk; a spring on the stem tending to force forward the valve disk;a stop on the stem limiting the forward movement of the valve disk; and means for operating the valve stem, substantially as described.

6. A by-pass connection between the pressure and suction sides of a pump, comprising a' casing havinf an opening therein for communication witthe pressure side of the pump, and an'openin for communication with the suction side of the pump; a suction l pipe communicating with the casing; a

valve disk adapted to close the first mentioned opening; a sleeve to which the disk is connected; a valve stem on the end` of which the sleeve is slidable; a stop disk on the stem; -a seat in the casing for the stop IIO disk; a spring on the stem tending to force forward the valve disk; a stop on the stem limiting the forward movement of the valve disk' and adapted to prevent its rotation; and means for operating the valve stem, substantially as described.

7. A by-pass connection between the presl sure and suction sides of a pump, comprising a casing having an opening therein for communication with the pressure side of the pump, and an opening for communication with the suction side of the pump; a suction pipe communicating with the casing; a valve disk adapted to close the first mentioned opening; a sleeve to which the disk is connected; a valve stem on the end of which the sleeve is slidable; a stop disk on the stem; a seat in the casing for the stop disk; a spring on the stem tending to force forward the valve disk; a stop on the stem limiting the forward movement of the valve disk; means for operating the valve stem, the parts being so proportioned that as the disks are forced home the valve disk contacts before the other, substantially as described.

8. A by-pass connection between the pressure and suction sides of a pump, comprising a casing having an opening therein for communication with the pressure side of the pump, and an opening for communication with the suction side of the pump; a suction pipe communicating with the casing; a valve disk adapted to close the first mentioned openin a stem on which the said disk is slida 1e but non-rotatable; a stop disk on the stem; a seat in the casin for the stop disk; a spring adapted to hol the valve dlsk against the aforesaid opening when the stop disk is on its seat; and means for operating the stem to press the stop disk against its seat or to retract both the stop disk and valve disk, substantially as described.

9. A by-pass connection between the pressure and suction sidesof a pump, comprisingv a casing having an opening therein for communication with the pressure side of a pump, and an opening for connection with the suction side of the pump; two suction pipes communicating with the casin a valve whereby either may be cut off rom communication with the suction opening; a communication between one of the suction pipes and the pressure openin and a valve controiiing said opening, su stantially as described.

l0. Aby-pass connection between the pressure and suction sides of a pump, comprising a casing having an opening therein for communication with the pressure side of a pump, and an opening for connection with the suction side of the pump; two suction pipes communicating with the casing; a valve whereby either may be cut of romA communication with the suction opening; a communication between one of the suction pipes and the pressure opening; a spring actuated safety valve normallyciosing the communication; and means for closing said valve or for opening it to permit lfree communication between the pressure opening and the suction pipe, substantlally as described. v

London, Ont., 30th January, 1908.

WILLIAM I-I. HEARD. Signed in the presence of- MABEL I. HENDERSON, WINAFRED D. REILLY. 

